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Updated: Aug 4, 2026
An In Vitro Model for the Study of Cellular Pathophysiology in Globoid Cell Leukodystrophy
Published on: October 21, 2014
Crystalloid inclusions in brain macrophages and hemopoietic tissue in GFAP-IL3 mice resemble inclusions identified in
H C Powell1, R S Garrett, A Muehlenbachs
1Department of Pathology, University of California at San Diego, La Jolla 92093-0612, USA. hpowell@ucsd.edu
Abstract:
Crystalloid inclusions or "pole bodies" observed in brain macrophages in human demyelinating disease represent a morphological enigma. Similar inclusions were detected in brain macrophages from the GFAP-IL3 mouse, a transgenic murine model for macrophage mediated demyelination. Mice also showed inclusions in hematopoietic tissue. They appear to be related to phagocytosis and secretion, respectively, as evidenced by the fact that in phagocytosing cells they often merged with lysozomes and that affected cells showed empty channels open to the interstitium. Based on ultrastructural and immunolocalization studies using chaperonin-10, lysozyme, and cathepsin the authors suggest that these inclusions are consistent with phagocytosis-related secretory products. This study may provide insight into the nature and significance of similar macrophage inclusions recently identified in multiple sclerosis.
Insights
Researchers identified unique crystalloid inclusions in brain macrophages, potentially linked to phagocytosis and secretion processes in demyelinating diseases like multiple sclerosis.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Crystalloid inclusions, or 'pole bodies,' in brain macrophages are poorly understood in human demyelinating diseases.
- Similar inclusions are found in the GFAP-IL3 transgenic mouse model, which exhibits macrophage-mediated demyelination.
Purpose of the Study:
- To investigate the nature and origin of crystalloid inclusions in brain macrophages.
- To explore the potential role of these inclusions in phagocytosis and secretion.
Main Methods:
- Ultrastructural analysis of macrophage inclusions.
- Immunolocalization studies using markers such as chaperonin-10, lysozyme, and cathepsin.
Main Results:
- Inclusions were observed in brain macrophages of both human demyelinating disease patients and GFAP-IL3 mice.
- Inclusions merged with lysosomes in phagocytosing cells, suggesting a link to phagocytosis.
- Affected cells displayed empty channels to the interstitium, indicating a secretory function.
Conclusions:
- The study suggests crystalloid inclusions represent phagocytosis-related secretory products.
- These findings may elucidate the significance of similar inclusions found in multiple sclerosis.
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